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釉结|中间层|星网状层|外釉上皮|内釉上皮 A. 成釉器周边是一单层立方状细胞，胞浆少，含有游离核糖体、少量粗面内质网、线粒体和少量散在的微丝，称为 B. 细胞为星形，有长的突起，细胞之间以相互连接成网状，称为 C. 由2～3层扁平细胞组成，细胞核卵圆形或扁平状，具有高的碱性磷酸酶活性，与釉质形成有关，称为 D. 由单层细胞构成，整齐排列在成釉器凹面的基底膜上，与牙乳头相邻，以半将细胞固定在基底板上，主要细胞器位于细胞核远端，称为 E. 在牙胚中央，内釉上皮局部增厚，且往往与釉连续，称为
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